Determine the moment about point A in Figure 2 Using Figure2

Determine the moment about point A in Figure 2 Using Figure-2 (above), replace the forces with a forces-couple system located at point A?

Solution

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4)

Take algebriac sum of moments about A.

Ma= -(50)(8)+100sin30(8+5)+30(4)

= - 400+650+120

= 370 lb.in (Anti clock wise)

5)

algebric sum of forces along x direction:

Fx=( 100cos 30) + 30= 116.6025 lb

Algebriac sum of forces along y direction:

Fy= 100sin(30) - 50

Fy=0

Couple:

Ma= 370 lb.in

By these three, we can replace the full system into force couple system